2000 Nissan Maxima with code P1612, how resolve this problem in my car?

DTC P1612 is a NATS (Nissan Anti Theft System) code.
Cycle the key ON for a second than OFF for 10 do this until the security light goes out.

If not you will have to key the key reprogrammed.

Hope this helps to solve it.

• NATS stands for Nissan Anti Theft System. What's happening is the anti-theft immobilizer is not reading your car keys.

• First if you just had a new key made then reset the light and see if it returns.

• A weak battery or bad grounds in the engine bay can cause this code as well. So check them first.

• If all else does not work the you have to get a new key because the chip in your key is bad. I recommend calling around to some locksmiths as some can do this and when they can it is often half the price of the dealership but tis key programming cannot be done at home.

• If you have any comments please feel free to leave them here.
• Hope this helps and thank you for using FixYa.